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Questions tagged [isc-dhcp]

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is available for free download under the terms of the ISC License, a BSD style license.

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TFTP Server for multiple vlans

I have a linux dhcp/tftp server with multiple vlans serving a CMTS. The gist of it is in the CMTS, I tell the cable modems on what vlan I want them to get their address and configuration file from. The tftp server address is 192.168.130.2 and the…
Mauricio Perez
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Having issues with DHCP classes

I'm having issues with DHCP classes matching mac addresses. We have a lot of one type of machine and I want to get the IPMI cards in the same pool. I've tried the following; class "IPMI" { match if (substring(hardware, 0, 3) = 0c:c4:7a); } subnet…
user1910748
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Which options are required to send a PAC file URL via DHCP to Android devices?

I would like the Android devices which connect to WiFi networks to be automatically configured to proxy their HTTP(S) traffic through a web proxy. There is a PAC file available though an URL, which points to a squid proxy. The PAC URL manually…
WoJ
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Is it possible to have an isc-dhcp server and a foreman proxy on the same network ?

I'm trying to setup a foreman service in my homelab to replace my current manually managed KVM solution. As part of this, I'm trying to get deployment working and the DHCP and DNS proxies working. I'm starting with DHCP. The problem that I'm seeing…
Anonymouslemming
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dhcpd (isc-dhcp-server) not using part of address range

dhcpd (isc-dhcpd-4.3.4 under Debian) ignores part of specified address range. I have the subnet 10.24.32.0/22 assigned to interface: 10.24.32.0/22 dev net0 proto kernel scope link src 10.24.32.1 So the possible address range is 10.24.32.1 to…
adiblol
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Linux machine gets different IP through and after installation

we have some automatic building of our building machines using packer (jessie, trusty, xenial, macos, ...) on separate network (VLAN on L3 switch which is used as default GW for the network). Till now, the network had some commercial DHCP server and…
user3337015
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Why does a DHCP4 client not respond to the DHCP Offer from a DHCP server?

An extremely simple DHCP server works reliably with Windows 10 PCs and Android devices. It receives DHCP Discover from a client, replies with DHCP Offer, then receives DHCP Request from a client. However, it does not work with a device using DHCP4.…
Hong
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What data is stored in DHCID RR by rfc 4701 (in lay terms)?

To understand what is going on my dhcp server I need to understand what is stored in this record that idenities my dhcp clients. I have long read this standart. But cannot understand. In lay terms I want to know what data relate to client is stored…
vskubriev
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Don't write "no free leases" messages from ISC DHCP server to systemd log

I have a DHCP server that provides TFTP server IP, NBP (Network Bootstrp Program) and IP addresses to PXE clients. When a machine boots normally (not PXE boot) it gets an IP address from another DHCP server. Every time a machine boots normally the…
xloto
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DHCP renew fails with multiple subnets on same link

Our network currently consists of 3 subnets on the same link: 1.2.3.0/24 is the global subnet 10.1.0.0/16 is used for NAT (because there are far more than 200 clients) 192.168.0.0/16 is the "guest network" with a simple captive portal for unknown…
cbix
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Force isc-dhcpd to disregard client hostname in ddns updates

I have the following configuration of isc-dhcpd-4.3.1: ignore client-updates; ddns-update-style interim; subnet 192.168.128.0 netmask 255.255.255.0 { use-host-decl-names on; update-static-leases on; key "rndc-key" { …
md_5
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Configuring ISC DHCP server to not serve IP's on the local network

Is it possible to have a DHCP server serve subnets for multiple network segments, but not its own local subnet? I have a DHCP server on a subnet 10.x.x.x. It serves approximately 125 subnets on various 10.x networks. I'm attempting to migrate this…
blindsnowmobile
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Create smaller subnets from large subnet

My network is 10.10.0.0/16. I would like to break this up into /24s. My environment: I use /etc/hosts with dnsmasq for DNS and isc-dhcp-server for DHCP on an Ubuntu 14.04 server (gateway, router) with two NICs. eth0 connects to the ISP switch and…
Kheldar Ambar
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classes declaration inside of subnets in isc dhcp

I would like to use class declarations based on a subnet scope, is that allowed? Or are all classes global scope? here is my dhcp.conf snippet: subnet 10.200.147.0 netmask 255.255.255.224 { authoritative; option domain-name-servers …
Polish Nightmare
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How do i keep ISC-DHCPD from offering different IPs when there is two requests from the same MAC

I have a set of Nodes which get their addresses from ISC-DHCPD. Since they boot using PXE, there will be two rounds of DHCP (one from the PXE, one from the OS) and for some reason, ISC-DHCPD will offer two different IPs. This is bad, since the…
Nuwanda
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